Vitamin D is a fat-soluble vitamin that plays a role in many important body functions. It is best known for working with calcium in your body to help build and maintain strong bones. Vitamin D is also involved in regulating the immune system and cells, where it may help prevent cancer. – University of Maryland Medical Center
Vitamin D is perhaps the most important nutrient when discussing bone or immune system health. Not only does adequate consumption of vitamin D preserve bone and immune system health, it’s also thought to prevent a number of serious health conditions.
A deficiency of vitamin D is best known for causing rickets (brittle bones) in children, a condition in which the tissue of the bone doesn’t fortify or mineralize. This condition often leads to fragile bones and skeletal deformities, frequently coinciding with increased risk of injury. However, more recent research is uncovering the link between vitamin D deficiency and a host of other health conditions.